Hello i am 18 yrs old and i started to have pain one of my testicles after having an erection it would sort of hurt during but not nearly as bad as after. when i feel them the veins of that testicle in pain it seems much thicker and there is also a lump of what i think are veins. what do i do? because i dont really know what to do plz help thank you. if you need more information just ask thanks again